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1
2
by Pigott, P. G.
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1971
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3
by Tyrrell, Miles E.
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1972
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1972
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4
by Tyrrell, Miles E.
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1972
[Washington, D.C.] : U.S. Dept. of Interior, Bureau of Mines, 1972
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5
by Bennett, James P. (James Philip), 1951-
Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1985
Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1985
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6
by Hughes, Randall E.
[Reston, Va.? : U.S. Geological Survey?, 1982
[Reston, Va.? : U.S. Geological Survey?, 1982
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7
by Hopkins, Thomas Cramer, 1861-1935
[Harrisburg, Pa] : [Wm. Stanley Ray, State printer], 1898
[Harrisburg, Pa] : [Wm. Stanley Ray, State printer], 1898
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8
[Washington, D.C.] : [U.S. Government Printing Office], 1927
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9
[Washington, D.C.] : [publisher not identified], 1856
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10
[Washington, D.C.] : [publisher not identified], 1840
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11
[Washington, D.C.] : [publisher not identified], 1836
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12
[Washington, D.C.] : [U.S. Government Printing Office], 1927
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13
Washington, DC : [publisher not identified], 1860
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14
[Washington, D.C.] : [publisher not identified], 1837
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15
[Washington, D.C.] : U.S. Dept. of Commerce, Economics and Statistics Administration, U.S. Census Bureau, 1999
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16
by Petty, A. V.
Pgh. [i.e. Pittsburgh], Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1982
Pgh. [i.e. Pittsburgh], Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1982
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17
[Washington, D.C.] : [publisher not identified], 1856
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18
[Washington, D.C.] : [U.S. Government Printing Office], 1863
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19
[Washington, D.C.] : [U.S. Government Printing Office], 1862
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20
[Washington, D.C.] : [publisher not identified], 1850
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